﻿//
// Copyright © MixModes Inc. 2011
//

using System;
using System.Globalization;
using System.Windows.Data;
using MixModes.Phone.Synergy.Utilities;

namespace MixModes.Phone.Synergy.Converters
{
    /// <summary>
    /// Determines if an enumeration value equals parameter
    /// </summary>
    public class EnumMatchConverter : IValueConverter
    {
        /// <summary>
        /// Modifies the source data before passing it to the target for display in the UI.
        /// </summary>
        /// <param name="value">The source data being passed to the target.</param>
        /// <param name="targetType">The <see cref="T:System.Type"/> of data expected by the target dependency property.</param>
        /// <param name="parameter">An optional parameter to be used in the converter logic.</param>
        /// <param name="culture">The culture of the conversion.</param>
        /// <returns>
        /// The value to be passed to the target dependency property.
        /// </returns>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            Validate.NotNull(value, "value");
            Validate.NotNull(parameter, "parameter");

            Type enumType = value.GetType();

            if (!enumType.IsEnum)
            {
                throw new InvalidOperationException("Enumeration type expected");
            }

            if (!(parameter is string))
            {
                throw new InvalidOperationException("Parameter must be string representation of enum value");
            }

            string enumStringValue = (parameter as string);

            Validate.StringNotNullOrEmpty(enumStringValue, "enumStringValue");

            return Enum.GetName(enumType, value) == enumStringValue;
        }

        /// <summary>
        /// Modifies the target data before passing it to the source object.  This method is called only in <see cref="F:System.Windows.Data.BindingMode.TwoWay"/> bindings.
        /// </summary>
        /// <param name="value">The target data being passed to the source.</param>
        /// <param name="targetType">The <see cref="T:System.Type"/> of data expected by the source object.</param>
        /// <param name="parameter">An optional parameter to be used in the converter logic.</param>
        /// <param name="culture">The culture of the conversion.</param>
        /// <returns>
        /// The value to be passed to the source object.
        /// </returns>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}
